BullpupArmory.com is a new website that is dedicated to offering accessories that are made to work with, you guessed it, bullpup style firearms. They also carry a growing array of other items like Magpul sights, slings, and magazines. There were showing their kydex check pieces for Kel-Tec bullpups, padded cheek pieces, and a single point sling adapter.
They also had a rail system that could be mounted forward of the Kel-Tec RFB’s hand guard. They will be bringing an extended version that ties into, replaces, and greatly extends the top optics mounting rail on the RFB.